Blood Boil

Blood Boil
	Blood Boil; Row 2 Blood death knight talent; 30 yd range; 1 Rune; 7.5 sec recharge; Instant; Deals (48.96% of Attack power) Shadow damage and infects all enemies within 10 yds with Blood Plague.; ; Blood Plague; A shadowy disease that drains [70.58% of Attack Power] health from the target over 24 sec.;
Properties
Class	Death knight
School	Shadow
Recharge	7.5 seconds
Talents
Talent required	[Heart Strike]
Improvements	[Hemostasis]
Related debuff
	Disease ; Blood Plague ; Draining [8.82% of Attack Power] health from the target every 3 sec. ; Duration: 24 seconds ;

For the Battle Pet, see [Remains of a Blood Beast].

Not to be confused with Gurtogg Bloodboil.

"There is only one way to ease the pain: death."^[1]

– Rantuko Grimtouch^[2]

Blood Boil in Hearthstone.

Blood Boil is a Blood death Knight area of effect damage spell that infects nearby enemies with Blood Plague.

Notes

In World of Warcraft: Trading Card Game.

Prior to patch 3.1.0, Blood Boil did no damage to targets with no diseases on them. Hence one would first stack the target with diseases, then use [Pestilence] to spread them to nearby mobs and then use Blood Boil. Until patch 6.0.2 this was still an effective method of boosting Blood Boil's damage, however it could still be used to do some damage even to undiseased enemies. Using Blood Boil in this fashion was primarily useful when tanking or for killing swarms of low-health targets.

Tips and tactics

As a tank, Blood Boil is very useful for picking up stray mobs while your other AoE abilities are on cooldown.

Patch changes

Hotfix (2023-02-06):
- Blood Plague damage increased by 15%.
- Blood Boil damage increased by 15%.
Patch 10.0.0 (2022-10-25): Now a row 2 Blood talent (was a level 17 Blood ability).
Hotfix (2020-12-11): Damage increased by 10%.
Patch 9.0.1 (2020-10-13): Now learned at level 17 (was 56).
Hotfix (2016-11-14): Blood Boil now deals full damage in PvP (was reduced).
Patch 7.0.3 (2016-07-19): Redesigned as a Blood-only ability. Now deals damage to nearby enemies and infect them with Blood Plague. Blood Plague now deals 82% more damage, drains health, and lasts for 24 seconds (down from 30)
Old: Deals Shadow damage to all enemies within 10 yards, and spreads your existing diseases from your target to all other enemies hit, refreshing them to full duration.
Patch 6.2.3 (2015-11-17): Damage has been increased by 10%.
Hotfix (2015-01-12): Blood Boil's damage has been reduced by 33.3%.
Hotfix (2014-10-15): Blood Boil should no longer incorrectly grant Scent of Blood or Runic Power if it doesn't strike a target. Additionally, Blood Boil should no longer incorrectly cause diseases to spread back to the casting Death Knight.
Patch 6.0.2 (2014-10-14): The effects of [Roiling Blood] and [Pestilence] have been consolidated into this ability.
Old: Boils the blood of all enemies within 10 yards, dealing X Shadow damage. Deals 50% additional damage to targets infected with Blood Plague or Frost Fever.
Patch 5.0.4 (2012-08-28): Now learned at level 56 (was 58).
Patch 3.1.2 (2009-05-19): If no target is available for Blood Boil to hit, the spell will now cast and consume a blood rune but generate no runic power.
Hotfix (2009-04-16): Blood Boil should no longer penetrate [Ice Block] or [Divine Shield].
Patch 3.1.0 (2009-04-14):
- Damage increased to make up for [Pestilence] no longer doing damage.
- Now does some damage to undiseased targets and extra damage to diseased targets. Its radius has been decreased.
Old: Causes any of the Death Knight's diseases on the target, and all enemies within 30 yards of the target, to painfully erupt, dealing X Shadow damage.
Patch 3.0.2 (2008-10-14): Added.